i want to make a CDC obj's Array, using MFC,

CObArray, CPtrArray, tried these 2.,

Code:
CPtrArray A;
A.Add( &CDC::CDC() );
A[0]->..... not OK
and this,
Code:
CObArray A;
A.Add( &CDC::CDC() ); // no errer. Is this OK?
A[0]-> ... can't get element.

help, pls.